.tab-focus() {
  outline: none;
  outline-offset: -2px;
}

.form-control-focus(@color: @input-border-focus) {
    @color-rgba: rgba(red(@color), green(@color), blue(@color), .6);
    &:focus {
        border-color: @color;
        outline: 0;
        .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px @{color-rgba}");
    }
}